Controlled heterogeneous nucleation of melt-textured YBa2Cu3O(6+x) by addition of Al2O3 particles
The reaction between alumina and yttrium barium cuprate subjected to a melt-texturing heat-treatment was studied. Microstructural examination of quenched, partially transformed samples revealed that at approx. 1050 deg C (which is above the incongruent melting temperature of YBa2Cu3O6+x), a reaction layer forms at the alumina interface. The reaction products were identified as Ba6y2A14015 and a copper-rich liquid phase. On cooling below the peritectic temperature, aligned domains of YBa2Cu3O6+x (123) were observed to preferentially nucleate at the reaction layer. For samples of melt-textured 123 deliberately seeded with alumina particles, it was found that nucleation and growth of 123 occurred exclusively at the particles. A reaction sequence for the formation of the Ba6y2A14015 is put forward, together with a discussion of the possible nucleation mechanisms for the 123. Yttrium Barium Copper Oxide(YBCO), Peritectic, Melt-texturing, Nucleation, Barium Yttrium Aluminum Oxide (Ba6y2A14015).
- Research Organization:
- Lehigh Univ., Bethlehem, PA (United States)
- OSTI ID:
- 5362735
- Report Number(s):
- AD-A-274605/5/XAB
- Country of Publication:
- United States
- Language:
- English
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360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COPPER COMPOUNDS
CUPRATES
HIGH-TC SUPERCONDUCTORS
INTERMETALLIC COMPOUNDS
MICROSTRUCTURE
NUCLEATION
OXIDES
OXYGEN COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES